CONSTRAINT CARDS

 

Description: The functions in the CONSTRAINT CARDS menu provide a means of constraining the degrees of freedom in model parts.

                           

 

Note: All of these options share this standard submenu.  Only the CREATE command differs with respect to each function and will be explained in the following pages.

 

CREATE                    Defines a new card.

DELETE                      Deletes a selected card or cards from those displayed in a pop-up window.

LIST                           Lists the cards in the option's database via pop-up window.

MODIFY                      Similar to the CREATE command, this command lists the defined cards in a pop-up window and allows the user to select and modify them.

EXIT

 

-CONSTRAINT CARDS: ADAPTIVITY

 

Description: This function defines adaptivity.

 

Usage:

 

1.  When CREATE is selected the CONSTRAINED ADAPTIVITY DEFINITION window pops up.

   The preceding commands yield varying definition cards.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: EULER IN EULER

             

Description:this fuction is used to define EULER IN EULER card.

 

Usage:

 

1.  When CREATE is selected the CONSTRAINED EULER IN EULER window pops up.

   The preceding commands yield varying definition cards.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: EXTRA NODES

 

Description: This function defines extra nodes for a rigid body

 

Usage:

 

1.  When CREATE is selected, DSI prompts:

>   SELECT OPTION

NODE

SET

   The preceding commands yield varying definition cards.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: GENERALIZED WELD

 

Description: This function defines spot and fillet welds.  Coincident nodes are permitted if the local coordinate ID is defined.  For the SPOTWELD, a local coordinate ID is not required if the nodes are offset.  Failures can include both the plastic and brittle failures.  These can be used either independently or together.  Failure occurs when either criterion is met.  The welds may undergo large rotations since the equations of rigid body mechanics are used to update their motion.

 

Usage:

 

1.  When CREATE is selected, DSI prompts:

>   SELECT OPTION

 

   The preceding commands yield varying definition cards.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: GLOBAL

 

Description: This function defines global constraints.

 

Usage:

 

1.  When CREATE is selected, the CONSTRAINED GLOBAL DEFINITION window pops up.

•        The preceding commands yield varying definition cards.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: JOINT STIFFNESS

 

Description: This function defines joint stiffness for joints defined by the previous option.

 

Usage:

 

1.  When CREATE is selected, DSI prompts:

>   SELECT OPTION

 

 

•        The preceding commands yield varying definition cards.  Refer to the     LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: LINEAR

 

Description: This function defines linear constraint equations between displacements/rotations, which can be defined in local/global coordinate systems.

 

Usage:

 

1. When CREATE is selected, DSI displays one definition card.  Refer to the     LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: LAGRANGIAN SOLID

 

Description: This function couples Lagrangian mesh shells, solids or beams to the material points of a Eulerain flow (master). This option may also be used to model rebar in concrete or tire cords in rubber.  The slave part or slave part set is coupled to the master part or master part set.

 

Usage:

 

1. When CREATE is selected, DSI displays one definition card.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: POINTS

 

Description: This function defines constrained points.

 

Usage:

 

1. When CREATE is selected, DSI displays one definition card.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: RIGID BODIES

 

Description: This function merges two rigid bodies.  One rigid body, the slave rigid body, is merged to the other one, called the master rigid body.

 

Usage:

 

1. When CREATE is selected, DSI displays one definition card.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: RIGID BODY STOPPERS

 

Description: This function defines constrained rigid body stoppers.

 

Usage:

 

1. When CREATE is selected, DSI displays one definition card.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: RIVET

 

Description: This function defines constrained rivets. 

 

Usage:

 

1. When CREATE is selected, DSI displays one definition card.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: SHELL TO SOLID

 

Description: This function defines a tie between a shell edge and solid elements.  Nodal rigid bodies can perform the same function and may also be used.

 

`Usage:

 

1. When CREATE is selected, DSI displays one definition card.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: TIE-BREAK

 

Description: This function defines a tied shell edge interface that can release locally as a function of plastic strain of the shells surrounding the interface nodes.  A rather ductile failure is achieved.

 

Usage:

 

1. When CREATE is selected, DSI displays one definition card.  Refer to the LS-DYNA User's Manual for further description.

 

-CONSTRAINT CARDS: TIED NODES W/FAIL

 

Description: This function defines a tied node set with the failure based on plastic strain.  The nodes must be coincident.

 

Usage:

 

1. When CREATE is selected, DSI displays one definition card.  Refer to the LS-DYNA User's Manual for further description.